[RFC][MERGE] refactoring of info tests

[Robert Collins]

This is a partial refactoring of the info tests, prompted when I
realised they all broke with a new tree format... 

It preserves the explicit declaration of what is wanted, but tries to
make that more 'I want a light checkout output' rather than 'this exact
sequence of bytes', so the tests require less adjustment while still
being valid.

Rob
-- 
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